Evaluate the amplitude of electric and magnetic field produced by the radiation coming from a `20 pi` W bulb `20%` and it is a point source.

Explanation

To solve the problem of evaluating the amplitude of the electric and magnetic fields produced by the radiation coming from a `20π` W bulb that operates at `20%` efficiency and is treated as a point source, we can follow these steps:

### Step 1: Determine the Output Power
Given the input power \( P' = 20\pi \) W and the efficiency \( \eta = 20\% = 0.2 \), we can calculate the output power \( P \) using the formula:
\[ P = \eta \times P' \]
Substituting the values:
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